EP4254952A2 - Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée - Google Patents

Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée Download PDF

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Publication number
EP4254952A2
EP4254952A2 EP23188026.1A EP23188026A EP4254952A2 EP 4254952 A2 EP4254952 A2 EP 4254952A2 EP 23188026 A EP23188026 A EP 23188026A EP 4254952 A2 EP4254952 A2 EP 4254952A2
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Prior art keywords
prediction
block
value
image
intra
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EP23188026.1A
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German (de)
English (en)
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EP4254952A3 (fr
Inventor
Akira Minezawa
Kazuo Sugimoto
Shunichi Sekiguchi
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/14—Coding unit complexity, e.g. amount of activity or edge presence estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder

Definitions

  • the memory 10 for intra prediction is a recording medium for storing the local decoded image calculated by the adding part 9.
  • a loop filtering part 11 carries out a process of carrying out a predetermined filtering process on the local decoded image calculated by the adding part 9 to output the local decoded image on which the filtering process is carried out.
  • the motion-compensated prediction frame memory 12 is a recording medium for storing the local decoded image on which the filtering process is carried out.
  • the variable length encoding part 13 carries out a process of variable-length-encoding the compressed data outputted thereto from the transformation/quantization part 7, the output signal of the encoding controlling part 2 (block division information about the division of each largest coding block, the encoding mode, the prediction difference encoding parameter, and the intra prediction parameters or the inter prediction parameters), and the motion vector outputted from the motion-compensated prediction part 5 (when the encoding mode is an inter encoding mode) to generate a bitstream.
  • the variable length encoding part 13 constructs a variable length encoding unit.
  • the equation (2) is not applied to any prediction block P i n having a block size of 16 ⁇ 16 pixels or more and a predicted value based on a conventional horizontal prediction (the luminance value S (-1, y) of an already-encoded pixel adjacent to the left of the prediction block P i n ) is set as a predicted value of the prediction image, while the equation (2) is applied only to blocks each having a size smaller than 16 ⁇ 16 pixels, thereby being able to suppress the increase in the amount of computation while improving the prediction performance as compared with the case of using the conventional horizontal prediction.
  • the intra prediction part generates prediction pixels for all the pixels of the luminance signal in the prediction block P i n , and outputs an intra prediction image P INTRAi n .
  • the intra prediction parameters used for the generation of the intra prediction image P INTRAi n are outputted to the variable length encoding part 13 in order to multiplex the intra prediction parameters into the bitstream.
  • each of the color difference signals is the one whose resolution is reduced to one-half that of the luminance signal (Y signal) both in a horizontal direction and in a vertical direction, and the complexity of each of the color difference signals is lower than that of the luminance signal and hence a prediction can be carried out on each of the color difference signals more easily than on the luminance signal.
  • the moving image encoding device can make the prediction process be more suitable for the characteristics of the video signal of the inputted image.
  • variable length decoding part 31 When receiving the bitstream generated by the moving image encoding device shown in Fig. 1 , the variable length decoding part 31 carries out a variable length decoding process on the bitstream (step ST21 of Fig. 4 ) and decodes the frame size information on a per sequence basis, each sequence consisting of one or more fames of pictures, or on a per picture basis.
  • the select switch 33 When the encoding mode m(B n ) variable-length-decoded by the variable length decoding part 31 is an intra encoding mode (when m(B n ) ⁇ INTRA), the select switch 33 outputs the intra prediction parameters of each prediction block unit, which are variable-length-decoded by the variable length decoding part 31, to the intra prediction part 34. In contrast, when the encoding mode m(B n ) variable-length-decoded by the variable length decoding part 31 is an inter encoding mode (when m(B n ) ⁇ INTER), the select switch outputs the inter prediction parameters and the motion vector of each prediction block unit, which are variable-length-decoded by the variable length decoding part 31, to the motion compensation part 35.
  • the inverse quantization/inverse transformation part 32 When receiving the compressed data and the prediction difference encoding parameters from the variable length decoding part 31, the inverse quantization/inverse transformation part 32 inverse-quantizes the compressed data by referring to the prediction difference encoding parameters according to the same procedure as that according to which the inverse quantization/inverse transformation part 8 shown in Fig. 1 does, and also carries out an inverse orthogonal transformation process on the transform coefficients which are the compressed data which the inverse quantization/inverse transformation unit inverse-quantizes by referring to the prediction difference encoding parameters to calculate a decoded prediction difference signal which is the same as the local decoded prediction difference signal outputted from the inverse quantization/inverse transformation part 8 shown in Fig. 1 (step ST28).
  • 1/t which is the scaling value used when a vertical prediction process is carried out by each of the intra prediction parts 4 and 34 is configured in such a way that the scaling value set for each column in the prediction block decreases with distance from the pixels adjacent to the left of the prediction block, the longer distance from the pixels adjacent to the left of the prediction block, and hence the lower correlation with the pixels the target pixel to be predicted has, the less influence of the pixels adjacent to the left of the prediction block can be exerted on the target pixel to be predicted.
  • 1/t which is the scaling value used when a vertical prediction process is carried out by each of the intra prediction parts 4 and 34 is configured in such a way that the scaling value set for each column in the prediction block decreases with distance from the pixels adjacent to the left of the prediction block, the longer distance from the pixels adjacent to the left of the prediction block, and hence the lower correlation with the pixels the target pixel to be predicted has, the less influence of the pixels adjacent to the left of the prediction block can be exerted on the target pixel to be predicted.
  • a video signal having a format which is to be processed by the moving image encoding device of Fig. 1 can be a YUV signal which consists of a luminance signal and two color difference signals or a color video image signal in arbitrary color space, such as an RGB signal, outputted from a digital image sensor, a monochrome image signal or an infrared image signal, or an arbitrary video signal in which each video frame consists of a series of digital samples (pixels) in two dimensions, horizontal and vertical.
  • the gradation of each pixel can be an 8-bit, 10-bit, or 12-bit one.
  • a method of determining the upper limit on the divided hierarchical layer number for example, there are a method of determining the same hierarchy depth, i.e., the same number of hierarchical layers for all the pictures according to the resolution of the video signal of the inputted image, and a method of increasing the depth of the hierarchy, i.e., the number of hierarchical layers to make it possible to detect a finer movement when the video signal of the inputted image has a large and vigorous movement, or decreasing the number of hierarchical layers when the video signal of the inputted image has a small movement.
  • the prediction block P i n i.e., a value which is obtained by scaling (S(x, -1)-S(-1, -1)) showing the amount of change in the horizontal direction of the luminance values of already-encoded pixels by a factor of 1/u) to the luminance value S(-1, y) of an already-encoded pixel adjacent to the left of the prediction block P i n which is a predicted value based on a conventional horizontal prediction (MPEG-4 AVC/H.264) to determine the addition result as a predicted value of the prediction image, a horizontal prediction which follows any change of the luminance value in the prediction direction can be implemented.
  • a horizontal prediction which follows any change of the luminance value in the prediction direction
  • intra prediction mode selectable intra prediction parameters for each of the color difference signals to be smaller than that for the luminance signal, and using a conventional simple prediction method for each of vertical and horizontal predictions, a reduction in the code amount required to encode the intra prediction parameters (intra prediction mode) and a reduction in the amount of computation required to carry out the prediction process can be implemented without reducing the prediction efficiency too much.
  • the intra prediction part 34 receives the intra prediction parameters of each prediction block unit outputted from the select switch 33, and carries out an intra prediction process on each prediction block P i n in the decoding block B n using the above-mentioned intra prediction parameters by referring to the decoded image stored in the memory 37 for intra prediction to generate an intra prediction image P INTRAi n according to the same procedure as that which the intra prediction part 4 shown in Fig. 1 uses (step ST26).

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
EP23188026.1A 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée Pending EP4254952A3 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2011140598 2011-06-24
JP2012009115 2012-01-19
EP12801936.1A EP2725795B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
PCT/JP2012/003555 WO2012176381A1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images en mouvement, appareil de décodage d'images en mouvement, procédé de codage d'images en mouvement et procédé de décodage d'images en mouvement
EP21160199.2A EP3849186B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image en mouvement, appareil de décodage d'image en mouvement, procédé de codage d'image en mouvement et procédé de décodage d'image en mouvement

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP12801936.1A Division EP2725795B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
EP21160199.2A Division EP3849186B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image en mouvement, appareil de décodage d'image en mouvement, procédé de codage d'image en mouvement et procédé de décodage d'image en mouvement
EP21160199.2A Division-Into EP3849186B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image en mouvement, appareil de décodage d'image en mouvement, procédé de codage d'image en mouvement et procédé de décodage d'image en mouvement

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EP4254952A2 true EP4254952A2 (fr) 2023-10-04
EP4254952A3 EP4254952A3 (fr) 2023-12-20

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EP12801936.1A Active EP2725795B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
EP21160216.4A Active EP3849187B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée
EP23188026.1A Pending EP4254952A3 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée
EP14182010.0A Active EP2824926B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
EP23188324.0A Pending EP4266683A3 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée
EP21160199.2A Active EP3849186B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image en mouvement, appareil de décodage d'image en mouvement, procédé de codage d'image en mouvement et procédé de décodage d'image en mouvement

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EP12801936.1A Active EP2725795B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
EP21160216.4A Active EP3849187B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée

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EP14182010.0A Active EP2824926B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'images, appareil de décodage d'images, procédé de codage d'images et procédé de décodage d'images
EP23188324.0A Pending EP4266683A3 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image animée, appareil de décodage d'image animée, procédé de codage d'image animée et procédé de décodage d'image animée
EP21160199.2A Active EP3849186B1 (fr) 2011-06-24 2012-05-30 Appareil de codage d'image en mouvement, appareil de décodage d'image en mouvement, procédé de codage d'image en mouvement et procédé de décodage d'image en mouvement

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US (6) US9723316B2 (fr)
EP (6) EP2725795B1 (fr)
JP (6) JP5389297B2 (fr)
KR (6) KR101895744B1 (fr)
CN (5) CN106686382B (fr)
BR (1) BR112013031133B1 (fr)
CA (5) CA2833902C (fr)
ES (4) ES2869201T3 (fr)
HK (1) HK1232359A1 (fr)
MX (3) MX347117B (fr)
PL (2) PL3849187T3 (fr)
RU (5) RU2547457C1 (fr)
SG (5) SG10201902274SA (fr)
TW (5) TWI571112B (fr)
WO (1) WO2012176381A1 (fr)

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